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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e82c0ea3340ec3753bb08f7d76b2e4fa8883a9a9b0eb448d85b6536b1c0f29d4' 
  AND token = 'Udi4WDLznMx8kjV4H0pJBcejb8drKfloGFoE2uOZ4u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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