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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'afa66bb2ae1c402cceeddbaa5e0912cde6d50286b26797f6e5b65c2c5f49de44' 
  AND token = '6nu4M4ovSQNJ7pIDyy2DsYRs1dqFTVMSwlgPCkGytyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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