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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '69b750d984747621ed55be7b3b7334705b326e606e037fda9cd70102f5e29726' 
  AND token = 'oonnEsuS6iZYcH8TTuNIBESQ5Xe4g2H0rqBR9n0Aa0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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