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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b34a14aa43119dc9d8f96c216258d4d753ae8826869a75d1a27ab2a3f9a7cf79' 
  AND token = 'yOpCI8VZuF2wktL3tcngiScEyuFKUlQMTNe5Q6TksNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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