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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '35dc05afb96a8f473e4a131dbbbc2100dc7055043ad6640c596d2118423360b9' 
  AND token = 'FwWmeoaUXLtjaGGSekDT8bq9dhO2rUHB/k9Obkqyd+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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