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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bc121fa4b9eac2796ae3a6326ab0c8ef0d0d11025a24fc1b13c45c2c2478a19d' 
  AND token = 'WtTvX0a9m5t4jt39BESuY5tne2OY4HcH3FwkbpAec8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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