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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ab07e528d17bb88ad3a3399e785c88f5b204232c8dc88d0a7b2c4f6c2441fb20' 
  AND token = 'iletWWPoKhbRm0vOgn5XkHp9nuCT42s8Lagsa1drdGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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