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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1dbbb966425671a6092523d8b8bcd956f51d970835b642630648e06dc5482c4b' 
  AND token = 'sFlXplVoNIH5vqYhqr7tfKbJPM1PMOrctM9tIdjFNmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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