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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7db03d91194564022e017bf20144d759c841a3f9f66169afc66853a403d41d00' 
  AND token = 'NR+RW1er6aEo/bV8qD4u2Dfgvx83wa/RVMxm8sweAfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}