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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'e48a9e57a5cad77cb8c570ebc18041409ac402b1b8be3a508f9a8fbb2db1b0a5' 
  AND token = 'OR6wU/SAr2khHNxVPpVtx3Y8JWy98oCGxKvCVI2AlCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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