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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e9a12cbabbc2399efcfe23a33f7f9c5a11dba6387425c576699e12ac38766f57' 
  AND token = 'IJov/8uPQDdIeVLXNkFIx/B7g3XEjCoj84DVibvEWE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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