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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f7256ae513290362ee7f009377201093c275c8d926dc436275836936f3680bf4' 
  AND token = '+3mY6CTuYUH6dAHD02epi/0QdI/79ZdmVumc2CuUD9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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