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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '26ae0ba1f6bd6b32e52b876753b58d5c7d65e1831fb7e1a8776ccac635bd1466' 
  AND token = 'zdscZBAhHhtHJ87b3NYgw/12sv/2nDXZzSUeATTkElA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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