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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c4ba527c6b1b56f4b667ea92e73e9e8ddfe6546da61423f733a30665774a5d34' 
  AND token = 'Kq8XF+uSkliyTjh4EjQ8a6iLpoqJA9mfnDHfK/f2NFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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