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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cff4d05ab94da94deb8594e4f6a37016e42cbac1b8ff5485b7afcec76269442c' 
  AND token = 'x1NKDf5pP0Mf/HJ+mfH+EW69Vjdbj3GCWVpo6OThl4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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