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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1ebb9c057c5d850c21fc725e601749f083f7e2f8b6b32006d13c082b07febd2e' 
  AND token = '5ehWDnycY03cXLRQPHbDsNFyHCI8yExXZ+HnvfVz/xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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