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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2b967a16312be81a2a1cc12cb81b9b3ccd1bf0068e4b8a86102ac34cf220b3cf' 
  AND token = 'cZHTddI3diBtq17rDaBE6OM1TdSY9GW8U82ERGEy+Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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