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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1c460c31ee28e2dcb616a591b4d93245cef27f0d8e17f6d87782571ca16100c5' 
  AND token = 'xiIpQopV8zoA37USItEQLp+qfEor8Rrh6B4Ji+QHAk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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