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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '28fa56a796b0f62aacaac0cb142a93e3498f5b949ad3ee04466f37af4db89699' 
  AND token = 'JJzsiHjp7EWVHtUStK7MEUu0pyj5oBjUg2I/3e2acWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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