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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '893a3b29d70d1d3091b900501a7eabc013ca2317d2968132b96e1734000c4ce8' 
  AND token = '/5sMMr/uXpgmGd4RLRz7QMdsxlVbnDd3Dkw2WA7Y09w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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