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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c8e02dafecd67ae9d0739460f05cb5496dbb2a16499e03afc7640c1953c33c95' 
  AND token = 'ChcmD1c7FVuJ2ScpHehUDa6iNVFR/O6UspnKz0m6AWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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