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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3161587c8bc8f19784cb19817f53428907d0f00616f7ae5b2c05aee2ebf9557d' 
  AND token = '5p/098C40Q+P7xE2KTGB/jH0TDv+IMF4xyp646NID04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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