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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '712b49685f072ac9d6ead8b0ffd531126ddc5f565cde82267e1d4f9eb402d67e' 
  AND token = 'kAXJBu799h0Foc+Au2Jon1ejSG9G6herHH4hLjtCx78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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