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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c80b6471b6bdba33e94b38933f6369ed702f97b0e4c26cdf5ed21d8ee249cd76' 
  AND token = '4OE4wAndwS1gF8gL2v/cBybnxpgokRf0ZBxt7Uhkwuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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