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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b66a77bba7245cdd91edece589bd57149ef26bede75dbf44c30db14a17f2a80a' 
  AND token = '1tJVki1lQPJFsSLWUUd80/IF/bZMZ5KrVX+L6WYSMn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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