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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1e5250d891cb3d1b83cf28f6a0eb25586ea8d05cc8f188704bcfa6628b23ba98' 
  AND token = 'G5odvMFSE88vL7Swh6pt3qpXviw5fsPo0vFH4szDtt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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