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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '35c99be6e6ec70c99270c7221e06b2fe3af1f82c83e3000e3f4d33532e30daa6' 
  AND token = 'sXG2iMwZl/6kDOXm4IASyvgGcgBRhcfLVgZRinvVbB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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