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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c7f939b953a71a5764f5c0d298909681e4a7d8bc337f8d6e81fb312788e1bee6' 
  AND token = 'd2wyO6Xg8LKRNcwm0INRGmTJIAAW317YZ3OCEupiMys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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