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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '151bde46adc896f87edc79034d95ff437e8600df6cb5923c799171d53032f9dd' 
  AND token = 'OhKH58orr1oicDPPgEwV7x4zetKEJWp2I6RcXgmAewc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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