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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '19f7789fa36c709dc812a4a099a3ac938f1868e390679fb39666a4f6a04fb554' 
  AND token = 'o5FGC3sIs97PDqoolMhJcowjPNcrRd5emhm/AWWjbwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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