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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '629aae16ce70da90664846d205b870e1f7407b45103852f547f06847f2d55d2c' 
  AND token = 'sxQFf8O9LMfUscPzv9z8AgFX4vYO3PdxZ4b+TW3XlIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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