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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8262ad1f956473ea7ba51057eb132d748cf6c68baaad5597593fe6d60f347e11' 
  AND token = 'raDX3v5nYr0EXxIiH0ns1K9NR+Zb0e6JwFrE2vXDVMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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