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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '75ec496d8f0284abd5f1c7c1c732ae8574cd288371c6f0c919cdeaebdddfbd10' 
  AND token = 'EHVhldo6dyYk8AXc3jsl7bPzxERgqzp1kzVJqMr7hUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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