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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cc810860e861a04db565c17bfccfb75101cabe4ea4c883d814b898a7b199683b' 
  AND token = 's7Gk8q5c00WrjzDEz/Myf7+qoVi8S+vce00jVT4HDBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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