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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7c8e726fba9adcd33d331de71501028073c97e3a1c28b8a9cddf13c69e5bb9f1' 
  AND token = 'KF4csekPYh1n4iC11X/gU/26lb+Kxm8wrFiSTKiCslQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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