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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd3badbb0b927e8dbf7b7c94f1f8d61c3e14bd9249d193b0ced9692af75ac647a' 
  AND token = 'cIfTeGMFyNdtT4NPktFFBkLkdYZh4dCCcMCGMMoiFTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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