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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bb22674c7ee558890746f4c4d1ec47bf2f8cbbb3175e09389a2f0a20bb6de17e' 
  AND token = '1q39vbecbBC+8EVcd8cnd3KR8F9QdAgIO0r1D5c4JQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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