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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '635e5e024a1265634a35e255f0ba734b37ff5c95b82b71bfb346e28783d534d2' 
  AND token = 'VX7oBFv2nvyOcLT7kZGcEryFPI/Ew5qFLfvaBuHFOQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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