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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '071ac8fae90b039d923d5451ecb64649ec2fe2849449dece64dffb0bccc5387e' 
  AND token = '0q+panEbls+LudBiCViOkMKX2jts4WSc42Pk+aZSXoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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