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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e5502f51eee0c863370e39c5da303e31795406790b88159b1434de3ce712eb21' 
  AND token = '00Ec6gEZqzZOIeHSLBBFeemBlPP1VdutDPvWgAH1t+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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