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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e2d2c82ae1ffb86b863e5c1e490f3144e9f0cccd99728c5113c179fc23ef34ce' 
  AND token = 'UAuKhwTWgooSqqXXrggzF98gctgnz2SMvLst7BeQSks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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