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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bbf9d51379a3fa0585d9771358db402582f986cb43abcb6e794555fd69469511' 
  AND token = 'erj95RLwbSrxWg0Zr5m48iCRfOI5GTYNPWgaKbM03u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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