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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fe67778c8ff5c6c04d5952b55c50605b70a4cc503d177cafc704eb87383abbaa' 
  AND token = 'IoZYM74J4Hc7uZGxtr8a4D+DaPPHPatSDj4vQ1wVXCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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