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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f0ff0fcaeb80242312b870774183569d796bd4832bb6afe4662eede88497e197' 
  AND token = 'E3DifZjSH90wdGyDlB0aPpl6a2YhoEpfIm4DCJfAaMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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