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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5f0b0345155f9031bd298f047637b98381a98b507d29a1c3d91eca3812373b36' 
  AND token = 'Xgi2cLJ8DICNyvmFXe2nCG8Tj2nUsXXR+FmNUzw861k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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