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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'fdd554e686525d41c5e48183b7bc52a2c614ba4388c56b7581c52164e832934e' 
  AND token = 'c0Xs3fT2yClxoCyssxDJuoWPkDOLFxZkmgVyb/44U7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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