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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4910250ecedfb6aaeafce174413f947ea94d8c95c3c32b4bd95a6288dd6309d8' 
  AND token = 'TIAAhZUM2cPZOzjPEw6rp7Sxkyhzp1Eu7OaebykS8Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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