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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '114b219d3a94dba25916408e836f0b84aead691452a78c516bc890854724aac8' 
  AND token = 'J4ks5alF15jX0z29y0xAdlrpkXM8htJt0QLz8+4epgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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