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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '760eea1fe7decad9a25323109baa19d961379308a0979114db1b2ac77a469c22' 
  AND token = 'ULg9cx8UCEhsRsBO9TAYIGSevJ5/9ix6oU6gsaTcyFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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