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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bcaeb9e0f4bea21d1f9e466cbee123f222f3b58092ea423c17e824bcfb724915' 
  AND token = 'nRG+nbHGNw8d4JtHTbHkDEM99iUmhaYqXc7D56HWXjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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