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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2b0cb104bfe8c437610464416213512abaa3ab410ad64dee53768b89f319b544' 
  AND token = 'Jmnf0c94qLB8NHqArRT4r8+LKBa9NoBsXo76vhSwEM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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