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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '73c2ed6bcd2533f3585a91fc8c20fce1e8bb9f49102b4e22c8aa9bb5bcc3c407' 
  AND token = 'vD66w8mjKvRpJ4k02BDb6v22XU+6j9TAEHaJWQtkImk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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