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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '692535582dc2ac91dc66a959c5becd0659b08d67a14105490b27c50b65644849' 
  AND token = '+Q1g95EvpaR4/T7pV+buFAQ/AtZMzreDA+VrX6HLhdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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